Drilling and tapping attachment.



W. J. BRENNAN.

DRILLING AND TAPPING ATTACHMENT.

APPLICATION FILED APR.26, 1915.

1,170,041 Patented Feb. 1', 1916.

I III 1 TTNTTED FFTQE.

JWILLZIAM J. ERENNAN, OF DAYTON, 0510.

DRILLING AND TAPPING ATTACHMENT.

amen.

Specification of Letters Patent. Patented Feb. 1, 1916.

Application filed April '26, 1915. Serial No. 23,790.

TocZZ whom it may concern: g V,

., Be it known-that I, TILLTAM J. BR N- Nnma citizen of theUnitedStates, residing at Dayton, in the county of Montgomery and Stateof Ohio, have invented certain new and useful Improvements. in Drillingand Tapping Attachments; and I do declare the following to' be a" full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

This invention relates to certain new and useful improvements indrilling and tapping attachments for use in drill presses or similarmachines.

The object of the invention is to provide simple and eiiicientattachment of the above character wherein the clutch devices 790/ 86 aredetachable from the gears upon which they are mounted and may bereplaced when usage requires it without discarding other parts lessliable to be aifected by usage, to the end that economy and efficiencyare preserved; and a further object of the said invention is to providea supporting frame constructed in one box-like integral piece in whichthe various elements may be conveniently assembled and removed, as willappear from the description to follow in connection with theaccompanying drawings.

Of the accompanying drawings, which illustrate the said invention,Figure 1 is a vertical sectional view showing the parts in their drivingposition; Fig. 2 is a cross sectional view on the line Z)b of Fig. 1;Fig. 3 is a vertical elevation of the several elements arranged injuxtaposition but disconnected.

In a detail description of the invention, similar reference charactersdesignate the same parts in both the description and the drawings.

The cage or inclosing frame 1 is of rectangular or box-like form with anopen side through which the parts are inserted and said frame has alinedtubular extensions 3 and 13. The open side of said frame is closed by acover plate 16 which is removably secured in position. A bushing orsleeve 2 is journaled within the tubular extension 3 of said frame andthe stock or shank 5' is screwed therein orotherwise 'con nectedtherewith. The said stock and bashingare constantly rotated in the samedirection, the said shank being of the usual form and insertible withinthe socket in the spindle of a drill press or other machine in which thedevice is to be used. The inner or lower end of the bushing or sleeve '2is ex teriorly screw-threaded to receive a main driving pinion 4. Thispinion 4 has its hub extended and interiorly screw-threaded to receive aclutch member (3 which thus be comes a detachable part of said pinion.The driven too-l spindle 9 extends through the clutch member 6 andpinion or driving gear 4 into the bushing 2 and carries a clutch member7 and a chuck or head 10 which holds the cutting tool or tap. Areversing pinion 12 is arranged opposite the driving pinion 4 and ofsmaller diameter so that the reverse movement will be imparted to thetool spindle 9 at an increased speed. This pinion 12 has a sleeve ortubular extension 2 which projects into the extension or frame portion13. The pinion 12, like the pinion 4, has its hub extended and providedwith interior screw-threads to receive another clutch member 11 whichbecomes a detachable part thereof. The pinion or gears 4 and 12 areconnected by an intermediate pinion 14 of similar construction andarranged upon an angle owing to the different diameters of the pinions 4and 12. The intermediate pinion 14 is mounted to rotate upon a stud 15which is screwed into the side of the frame and secured by a nut 17.

The operation of the tool is readily understood. When the clutch member6 is engaged by the clutch member 7 on the tool spindle, the saidspindle is driving in the same direction with the shank 5 and at auniform speed therewith; the tap is then boring the hole. The withdrawalof the tap from the hole is done when the clutch members 7 and 11engage, at which the reverse or withdrawal movement is imparted to thetool spindle 9.

The detachable character of the pinions 4 and 12 with reference to theclutch members 6 and 11 has the advantageous features of thereby beingable to discard the clutch members when they become worn out orineflicient without in a like manner discarding the gears. In a word,new clutch members may be inserted in the gears in the places of thoseremoved. And further,

owing to the clutches 6 and 11 being detachable from the gears, it ispossible to assemble the parts in a frame of comparatively narrow Wallsand of a compact form. The gear 14 may first be placed in position, thenthe sleeve 2 may be inserted in position and the gear 12 and its sleevetogether with the clutch member 11 supported by said gear, after whichthe driving gear 4: may be screwed onto the exposed end of the sleeve 2.

Having described my invention, I claim.

In an attachment for tapping machines, the combination With a framecomprising two parallel Walls united by a vertical Wall, said parallelWalls having alined tubular extensions, of a bushing in one of saidextensions having an exteriorly screw-threaded end Within said frame, adriving spindle connected with said bushing, a driving pinion, anintermediate pinion connecting said of said bushing and having an axialextension, a clutch member having a screwthrcaded connection With saidaxial extension, a driven pinion having a sleeve extended into the.other tubular extension of said frame, said driven pinion having anaxial extension, a clutch member screwed into the axial extension ofsaid driven pinion, an intermedite pinion connecting said driving anddriven pinions, a tool spindle extending through said 'pinions and theclutch members carried thereby, and a clutch member carried by said toolspindle and adapted to engage one or the other of the clutch memberscarried by said pinions, substantially as specified.

In testimony whereof I aifi'x my signature.

WILLIAM J. BRENNAN.

Copies of this patent may be obtained for five cents each, by addressingthe f Commissioner of Patentsv Washington, D. C.

